TY - GEN
T1 - New readout and data-acquisition system for reducing dead time in the Gamma Ray Compton Telescope
AU - Yoshikawa, K.
AU - Tanimori, T.
AU - Takada, A.
AU - Mizumoto, T.
AU - Mizumura, Y.
AU - Komura, S.
AU - Kishimoto, T.
AU - Takemura, T.
AU - Nakamasu, Y.
AU - Taniguchi, T.
AU - Nakamura, Y.
AU - Kubo, H.
AU - Sawano, T.
AU - Nakamura, K.
AU - Sonoda, S.
AU - Miuchi, K.
AU - Kurosawa, S.
AU - Parker, J. D.
PY - 2018/11/12
Y1 - 2018/11/12
N2 - For MeV gamma-ray astronomy, We have developed an electron-tracking Compton camera (ETCC) as a next generation satellite telescope. Our detector consists of a Comptonscattering target and a scattered gamma-ray absorber. The target is a gaseous Time Projection Chamber (TPC), which uses \mu PIC as the 2-dimensional readout detector, and the absorber is position sensitive scintillation arrays (PSAs). We developed a prototype ETCC and certificated its performance in a groundbased experiment. The prototype ETCC had a sharp PSF of 15° included 50%, 662 keV) at the ARM of 5° and the SPD of 100°. We plan to update the prototype ETCC and observe the electronpositron annihilation line of the galactic center in Australia in early 2018 (SMILE-II +). In the data acquisition (DAQ) system of the prototype ETCC, the dead time is estimated to be \sim 20 % at the trigger rate of \sim 100 Hz in a balloon observation, and the prototype ETCC can work. The SMILE-II + ETCC can also work at the balloon altitude. On the other hand, in the future observation with the ETCC, that has a larger effective area than the effective area of SMILE-II + ETCC, the DAQ rate is expected to be \sim~1 kHz. The dead time gets saturation due to sending data via VME bus and common start system in PSA. To overcome the two problem, we develop a new TPC readout board and a PSA readout unit. We create a test model ETCC which have the new TPC readout boards and the new PSA readout units. Although the dead time is \sim 20 % at 30 Hz with a small ETCC in the prototype DAQ system, the dead time is \sim 20 % at 2 kHz in the new system.
AB - For MeV gamma-ray astronomy, We have developed an electron-tracking Compton camera (ETCC) as a next generation satellite telescope. Our detector consists of a Comptonscattering target and a scattered gamma-ray absorber. The target is a gaseous Time Projection Chamber (TPC), which uses \mu PIC as the 2-dimensional readout detector, and the absorber is position sensitive scintillation arrays (PSAs). We developed a prototype ETCC and certificated its performance in a groundbased experiment. The prototype ETCC had a sharp PSF of 15° included 50%, 662 keV) at the ARM of 5° and the SPD of 100°. We plan to update the prototype ETCC and observe the electronpositron annihilation line of the galactic center in Australia in early 2018 (SMILE-II +). In the data acquisition (DAQ) system of the prototype ETCC, the dead time is estimated to be \sim 20 % at the trigger rate of \sim 100 Hz in a balloon observation, and the prototype ETCC can work. The SMILE-II + ETCC can also work at the balloon altitude. On the other hand, in the future observation with the ETCC, that has a larger effective area than the effective area of SMILE-II + ETCC, the DAQ rate is expected to be \sim~1 kHz. The dead time gets saturation due to sending data via VME bus and common start system in PSA. To overcome the two problem, we develop a new TPC readout board and a PSA readout unit. We create a test model ETCC which have the new TPC readout boards and the new PSA readout units. Although the dead time is \sim 20 % at 30 Hz with a small ETCC in the prototype DAQ system, the dead time is \sim 20 % at 2 kHz in the new system.
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U2 - 10.1109/NSSMIC.2017.8532606
DO - 10.1109/NSSMIC.2017.8532606
M3 - Conference contribution
AN - SCOPUS:85058434764
T3 - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
BT - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017
Y2 - 21 October 2017 through 28 October 2017
ER -